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單項(xiàng)選擇題

There shall be two principal （） through the harbor for the passage of vessels of over 60 tons burden．

A.straits
B.channels
C.canals
D.roadsteads

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單項(xiàng)選擇題

The transfer procedures for oil products are required to be posted （）.

A.in the pilothouse
B.in the officer's lounge
C.in the upper pumproom flat
D.where they can be easily seen or readily available

單項(xiàng)選擇題

The step of a pilot ladder which prevents the ladder from twisting is the （）.

A.Proof bar
B.Shifting bar
C.Long bar
D.Spreader